The "it depends on how efficient you are" thing is really key. The easiest way to have no free time is to listen to anyone and everyone willing to offer you suggestions on how to study. You really need to find out for yourself. There's a chance that to understand the material, especially early in your law school career, you'll have to spend all your time studying. And in say the first semester of 1L, you might way to play it safe and lean toward studying more than you need to. But you probably won't if you have effective study skills (work smarter not harder) and work for yourself, not how much or how long someone says you should.